Excreção de nitrogênio e fósforo em pisciculturas

Autores

Palavras-chave:

excreção, qualidade da água, amônia, poluição

Resumo

A preocupação com a quantidade de resí­­duos gerados a partir da criação de peixes é um fator decisivo na sustentabilidade da piscicultura para os próximos anos. Com a grande intensificação dos sistemas de criação de peixes, a carga de resí­­duos lançados í­Â  água de cultivo aumentou significativamente. Os compostos nitrogenados e fosforados são os principais produtos de excreção dos peixes, e ambos podem afetar não só a água de cultivo como o ambiente como um todo. A produção de resí­­duos metabólicos de N e P pelos peixes é determinada por diversos fatores endógenos e exógenos como genética, idade, tamanho, ambiente de criação e dieta. Em relação ao N, a excreção na forma de amônia é predominante, e quando em altos ní­­veis pode ser devida a uma alta ingestão proteica ou a dietas inadequadamente formuladas, as quais causam desequilí­­brio na sí­­ntese proteica. A excreção de P, usualmente 69-86% P da dieta, está associada í­Â s fontes utilizadas, as quais são aproveitadas de forma distinta nas diferentes espécies. O uso de fitase nos alimentos para peixes é uma boa alternativa para a redução da excreção do P. A padronização da formulação de dietas e a mensuração de taxas reais de excreção de N e P nos diversos sistemas de criação (principalmente os intensivos) deverão ser mais bem estudados, uma vez que ao menos uma diminuição de 2 a 3 vezes da taxa de excreção desses poluentes nas pisciculturas pode ser alcançada.

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2018-11-04

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